WO2011038526A1 - Procédé et dispositif de relais - Google Patents

Procédé et dispositif de relais Download PDF

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Publication number
WO2011038526A1
WO2011038526A1 PCT/CN2009/001104 CN2009001104W WO2011038526A1 WO 2011038526 A1 WO2011038526 A1 WO 2011038526A1 CN 2009001104 W CN2009001104 W CN 2009001104W WO 2011038526 A1 WO2011038526 A1 WO 2011038526A1
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WO
WIPO (PCT)
Prior art keywords
packet
mobile terminals
coded
packets
bit
Prior art date
Application number
PCT/CN2009/001104
Other languages
English (en)
Chinese (zh)
Inventor
李纪
胡中骥
Original Assignee
上海贝尔股份有限公司
阿尔卡特朗讯
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to PCT/CN2009/001104 priority Critical patent/WO2011038526A1/fr
Priority to CN200980160593.5A priority patent/CN102474340B/zh
Publication of WO2011038526A1 publication Critical patent/WO2011038526A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15521—Ground-based stations combining by calculations packets received from different stations before transmitting the combined packets as part of network coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting

Definitions

  • the present invention relates to the field of wireless transmission, and in particular to a relay method and device thereof. Background technique
  • a relay device In LTE-Advanced, trunking is considered an important technology to support high capacity and high coverage.
  • a relay device In the uplink, a relay device usually needs to forward information for multiple mobile terminals (UEs), and in a conventional relay device, it is forwarded in a UE-by-UE manner.
  • UEs mobile terminals
  • FDM Frequency Division Multiplexing
  • the packet needs to be decoded and re-coded UE by UE, and the channel decoder and channel coder become the main complexity of the relay side.
  • Embodiments of the present invention propose a relay method and apparatus therefor.
  • a relay method including: soft combining a bit likelihood of each coded bit in a packet from a plurality of mobile terminals to generate soft network coded packet information;
  • the soft network encodes the packet information for channel decoding to obtain a network coded packet; performs channel coding and modulation on the network coded packet; and transmits the modulated network coded packet to the base station.
  • a relay signal processing method comprising: softening a first bit likelihood of each coded bit from a plurality of mobile terminals and a packet from a relay device Combining, generating a second bit likelihood of each coded bit of each of the mobile terminal from the plurality of mobile terminals, wherein the packet from the relay device is the relay device pair from the a network coded packet obtained by soft combining the packets of the plurality of mobile terminals; performing channel decoding on the second bit likelihood to obtain a packet from each of the plurality of mobile terminals.
  • a relay device including: a merging unit, configured to soft combine a bit likelihood of each coded bit in a packet from a plurality of mobile terminals to generate soft a network coding packet information, a decoding unit, configured to perform channel decoding on the soft network coding packet information, to obtain a network coding packet, a coding unit, configured to perform channel coding on the network coding packet, and a modulation unit, configured to perform channel coding
  • the subsequent network coded packet is modulated; the first sending unit is configured to send the modulated network coded packet to the base station.
  • a base station comprising: a signal combining unit for first bit likelihood of coding bits for each of a plurality of mobile terminals and packets from a relay device Performing soft combining to generate a second bit likelihood of each coded bit of each of the mobile terminals from the plurality of mobile terminals, wherein the packet from the relay device is from the relay device pair a network coding packet obtained by soft combining the packets of the plurality of mobile terminals; a channel decoding unit, configured to perform channel decoding on the second bit likelihood, to obtain a packet from each of the plurality of mobile terminals .
  • a communication system including the base station, the relay, and the plurality of mobile terminals described above.
  • the implementation of the present invention improves the resource utilization of the signal relay due to the transmission of two copies of data on one system resource.
  • the soft-combined received signal requires only half of the channel decoding and re-channel coding operations. Since the channel decoder and the channel coder are the main complexity of the relay side, the relay method of the present invention can save nearly half of the computational complexity with respect to the general decoding and forwarding relay.
  • FIG. 1 shows a schematic diagram of a communication system in accordance with an embodiment of the present invention
  • FIG. 2 is a block diagram of the relay device shown in FIG. 1 according to an embodiment of the present invention
  • FIG. 3 is a block diagram showing the base station shown in FIG. 1 according to an embodiment of the present invention
  • FIG. 4 is a flowchart showing processing on the relay device side according to an embodiment of the present invention.
  • FIG. 5 is a flowchart showing a process of a base station side according to an embodiment of the present invention.
  • Figure 6 shows a schematic diagram of the flow chart shown in Figure 5;
  • FIG. 7 shows an effect diagram of a relay method according to an embodiment of the present invention.
  • the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, and the details and functions that are not necessary for the present invention are omitted in the description to avoid confusion of the understanding of the present invention.
  • a wireless communication system is proposed. As shown in Fig. 1, the system includes a relay device, a base station, and a plurality of mobile terminals (UEs) described below.
  • UEs mobile terminals
  • the base station includes a merging unit 230 for soft combining bit likelihood of each coded bit in a packet from a plurality of mobile terminals to generate a soft network coding.
  • a decoding unit 240 configured to perform channel decoding on the soft network encoded packet information to obtain a network encoded packet;
  • an encoding unit 260 configured to perform channel coding on the network encoded packet;
  • a modulating unit 270 configured to encode the channel
  • the network coding packet is modulated;
  • the first sending unit 280 is configured to send the modulated network coded packet to the base station.
  • the relay device further includes a demodulation unit 220 for demodulating packets from the plurality of mobile terminals to obtain a bit likelihood of each of the coded bits in each of the packets.
  • the relay device further includes a control unit 250, configured to determine whether the channel decoding performed on the soft network encoded packet information is correct, and if the determination result is correct, the control encoding unit 260 re-channelizes the channel-decoded soft network encoded packet information. .
  • the relay device also includes a first receiving unit 210 for receiving packet signals from a plurality of mobile terminals.
  • a base station is also proposed. As shown in FIG. 3, the base station includes a signal combining unit 230 for performing a first bit likelihood ratio for each of the coded bits from the plurality of mobile terminals and the packets from the relay device.
  • Soft combining generating a second bit likelihood of each coded bit of each of the mobile terminals from the plurality of mobile terminals, wherein the packet from the relay device is a relay device performing packets from the plurality of mobile terminals
  • the network coding packet obtained by soft combining; the channel decoding unit 240 is configured to perform channel decoding on the second bit likelihood to obtain a packet from each of the plurality of mobile terminals.
  • the base station further includes a base station demodulation unit 220 for demodulating packets from a plurality of mobile terminals and from the relay device to obtain a first bit likelihood for each coded bit of each packet.
  • the base station also includes a first receiving unit 210 for receiving packet data from a plurality of mobile terminals and relay devices.
  • each of the components shown in FIGS. 2 to 4 can be implemented by a plurality of devices in practical applications, showing many The components can also be integrated in a single chip or a device in practical applications.
  • the base station and the relay device may also include Any unit and device used for other purposes.
  • step 410 the first receiving unit 210 of the relay device receives packets from a plurality of UEs. Taking two UEs as an example, the packets received by the relay device are:
  • SS 2 is the symbol transmitted by UE1 and UE2, respectively, and / 3 ⁇ 4 R are the fading channel models of UE1 and UE2 to the relay device respectively, and ⁇ is the independently distributed Gaussian white noise on these channels, and its square ⁇ .
  • step 420 the demodulation unit 220 of the relay device demodulates the received plurality of packets, respectively.
  • step 430 the merging unit 230 of the relay device soft combines the likelihood ratios of the plurality of UEs obtained by the demodulation to generate soft network coding packet information, so that the received signal is P1 ® P2, and Not P1 and P2.
  • a packet network coding in bits P NC having b NC As shown in Table 1 possibilities, which is a packet P! Is a coded bit, b2 is in the packet P 1 ⁇ 2 corresponding to the coded bits, encoding means for encoding a network packet from a network of a plurality of sources
  • the network coded bits refer to the bits after network coding.
  • step 440 the decoding unit 240 of the relay device performs channel decoding on the soft network encoded packet information. This step is to perform channel decoding on ( e ). As described above, in the case that the relay device receives correctly, the decoded packet obtained should be P1®P2.
  • step 450 the control unit 250 of the relay device determines whether channel decoding has been correctly performed.
  • the CRC check code can be used to determine whether the channel decoding is correct. Since the network coding is linear operation, the network-encoded CRC check bit can still be used to judge whether the decoding is correct or not. Of course, those skilled in the art should know that the manner of determining whether the channel decoding is correct is not limited to the CRC check code used in the present embodiment.
  • step 460 the packet obtained by the channel decoding is relayed according to a conventional method, for example, in the AF (Amplified Forwarding) relay, the packet obtained by decoding the channel; P1 and P2 are amplified and Forward.
  • step 470 the encoding unit 260 of the relay device re-channel encodes the decoded network encoded packet, and modulates by the modulator 270 in step 480, and passes the first transmitting unit in step 490. 280 to send.
  • the demodulation unit 220 and the modulation unit 270 may be implemented by a single chip, and the decoding unit 240 and the coding unit 260 may also be implemented by a single chip.
  • the step of reproducing and/or amplifying the received packet may also be included.
  • Figure 5 is a flow chart of the processing performed by the base station side for the packet signal relayed according to the method of Figure 4. The processing on the base station side will be described below with reference to Fig. 5.
  • the second receiving unit 310 of the base station receives signals from different UEs and relay devices, respectively. As in the present embodiment, it is received from UE1 and UE2, respectively:
  • S ⁇ S ⁇ n S 3 are symbols transmitted from UE1, UE2 and the relay device, respectively, /3 ⁇ 4, 2 and B are UE1, UE2 and the relay apparatus to the base station of the fading channel model, 3 ⁇ 4 ,, 3 ⁇ 4, 2 and 3 ⁇ 4B are Gaussians with those independent white noise distribution channels incorporated variance ⁇ 2, and wherein, at the relay device is a S. 3 S ⁇ BS 2 performs soft combining and re-channel coding the corresponding modulation symbols in the network coded packet.
  • step 520 the base station demodulation unit 320 pairs are received from UE1, UE2 and the relay device to the packet Pl, P2 and P3 (S,> S 2 and S 3 respectively, Pl, P2, and P3 an example of symbol, Pl, P2, and P3 each contain a large number of transmission symbols.
  • step 530 the signal combiner 330 of the base station soft combines the likelihoods of the obtained P1, P2, and P3.
  • LLR ⁇ b « LLR (6, ) + max (LLR (3 ⁇ 4 c ), LLR (3 ⁇ 4))- max (0, LLR (b NC ) + LLR (b 2 ))
  • the second bit likelihood JZi?() in P2 can also be generated by a similar method.
  • the channel decoder 340 of the base station performs channel decoding on the second bit likelihood of each of the coded bits in the soft combined signal to obtain respective information bits in the packet P1 and the packet P2, respectively.
  • FIG. 6 shows a brief flow of performing soft combining processing on the base station side, wherein the processing of step 610 and step 620 is the processing of P3 in step 520.
  • the processing of P1 and P2 is omitted in FIG.
  • Step 630 is the same as step 530
  • step 640 is the same as step 540.
  • in order to use the network coding information for soft combining only one additional preprocessing described in equation (12) needs to be added, that is, Figure 6
  • the preprocessing has a very low complexity.
  • the channel is assumed to be a Rayleigh channel, and the Rayleigh fading has a unit variance that is interfered by Gaussian white noise.
  • UE1 and UE2 have the same channel state, the link between the relay device-base station has the same channel state as the link between the UE-base station, and the link quality between the UE-relay devices is higher than that of the UE-base station. The quality of the link is good.
  • the channel coding uses a UMTS l/3 Turbo code with a length of 3456 bits and the modulation type is QPSK.
  • Fig. 7 shows the simulation results.
  • the horizontal axis is the signal-to-noise ratio (E b /No) and the vertical axis is the error grouping ratio (PER).
  • E b /No the signal-to-noise ratio
  • PER error grouping ratio
  • the technical solution proposed by the embodiment of the present invention has gradual performance compared to the non-relay mode, and the performance approaches the traditional XOR network coding.
  • the purpose of the relay layout is to improve the performance of the cell edge user, it is a very common case that the UE-relay link is better than the UE-base station link by several dB .
  • the soft network coding relay can be used instead of the XOR relay in the embodiment of the present invention to achieve XOR relay performance and further reduce computational complexity.
  • the technical solution proposed by the embodiment of the present invention saves 50% of the resources by merging the information originally sent in the two resources into one resource. Transmit power.
  • the soft network coding method proposed by the present invention can save nearly half of the computational complexity on the relay station.
  • the technical solution proposed in the embodiment of the present invention is not limited by the wireless transmission mode, and is different in frequency division, time division, space division or code division mode, and the difference is only in the resources used for transmission, and the person skilled in the art may
  • the wireless transmission method easily uses the embodiments of the present invention for various wireless transmission systems.
  • UE1 and/or UE2 in the embodiment of the present invention may also be replaced by another one/two relays.
  • some embodiments also include a machine readable or computer readable program storage device (eg, a digital data storage medium) and encoding machine executable or computer executable program instructions, wherein the instructions perform some of the above methods or All steps.
  • the program storage device can be a digital memory, a magnetic memory Storage media (such as disk and tape), hardware or optically readable digital data storage media.
  • Embodiments also include a programming computer that performs the steps of the above method.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé et sur un dispositif de relais. Le procédé comprend les étapes suivantes : on combine de manière souple les rapports de probabilité d'élément binaire de chaque élément binaire codé dans les paquets provenant de multiples terminaux mobiles afin de générer des informations de paquets à codage de réseau souple, on exécute un décodage de canal pour les informations de paquets de codage de réseau souple afin d'obtenir un paquet de codage de réseau, on exécute un codage et une modulation de canal pour le paquet de codage de réseau, et on adresse le paquet de codage de réseau modulé à une station de base. Une application du procédé et du dispositif peut mettre en œuvre un relais de signal avec un rendement d'utilisation de ressource élevée et économiser presque la moitié de la complexité de fonctionnement d'un dispositif de relais.
PCT/CN2009/001104 2009-09-29 2009-09-29 Procédé et dispositif de relais WO2011038526A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2009/001104 WO2011038526A1 (fr) 2009-09-29 2009-09-29 Procédé et dispositif de relais
CN200980160593.5A CN102474340B (zh) 2009-09-29 2009-09-29 中继方法及其设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2009/001104 WO2011038526A1 (fr) 2009-09-29 2009-09-29 Procédé et dispositif de relais

Publications (1)

Publication Number Publication Date
WO2011038526A1 true WO2011038526A1 (fr) 2011-04-07

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1881965A (zh) * 2005-06-01 2006-12-20 株式会社Ntt都科摩 通信中继设备和通信接收机
CN101420291A (zh) * 2008-12-08 2009-04-29 北京邮电大学 中继系统中网络与信道编码的联合译码方法
US20090213854A1 (en) * 2008-02-21 2009-08-27 Telcordia Technologies, Inc. Efficient, fault-tolerant multicast networks via network coding

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1881965A (zh) * 2005-06-01 2006-12-20 株式会社Ntt都科摩 通信中继设备和通信接收机
US20090213854A1 (en) * 2008-02-21 2009-08-27 Telcordia Technologies, Inc. Efficient, fault-tolerant multicast networks via network coding
CN101420291A (zh) * 2008-12-08 2009-04-29 北京邮电大学 中继系统中网络与信道编码的联合译码方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SHENGLI ZHANG ET AL.: "Soft Network Coding in Wireless Two-Way Relay Channels", JOURNAL OF COMMUNICATION AND NETWORKS, vol. 10, no. 4, 31 December 2008 (2008-12-31), pages 371 - 383, XP011483599, DOI: doi:10.1109/JCN.2008.6389853 *

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CN102474340A (zh) 2012-05-23
CN102474340B (zh) 2014-11-05

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